The film keeps really well honestly. All the Fuji instant stuff keeps far better than Polaroid. For whatever reason they are getting a much better seal on their pods. Also, the color shifts are much less. I shot 9 year old Instax film and every shot covered completely. There was a slight color shift but nothing like the orange cast and lack of contrast that ruined Polaroid 600 shots.
Remember that the ISO 3200 is actually an ISO ~1000 formulation with a reflective back layer to add to the sensitivity. So it isn't nearly as sensitive to age as real ISO 3200 film.